Imaging Young Stellar Objects with VLTi/PIONIER
Le Bouquin, J-B
Le Coroller, H
Observatoire de Haute-Provence, Institut Pythéas
Optical interferometry imaging is designed to help us to reveal complex astronomical sources without a prior model. Among these complex objects are the young stars and their environments, which have a typical morphology with a point-like source, surrounded by circumstellar material with unknown morphology. To image them, we have developed a numerical method that removes completely the stellar point source and reconstructs the rest of the image, using the differences in the spectral behavior between the star and its circumstellar material. We aim to reveal the first Astronomical Units of these objects where many physical phenomena could interplay: the dust sublimation causing a puffed-up inner rim, a dusty halo, a dusty wind or an inner gaseous component. To investigate more deeply these regions, we carried out the first Large Program survey of HAeBe stars with two main goals: statistics on the geometry of these objects at the first astronomical unit scale and imaging their very close environment. The images reveal the environment, which is not polluted by the star and allows us to derivethe best fit for the flux ratio and the spectral slope. We present the first images from this survey and the application of the imaging method on other astronomical objects.
This work is supported by the French ANR POLCA project (Processing of pOLychromatic interferometriC data for Astrophysics, ANR-10-BLAN-0511)
OHP 2013: International Colloquium at Haute-Provence Observatory, France, 23-27 September 2013 - Improving the performances of current optical interferometers and future designs
This is the final version of the paper. Available from the publisher via the URL in this record.
Proceedings of the OHP2013 colloquium, pp. 263-273